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Yokogawa ANB11D-215/BU2B CENTUM VP / CENTUM CS 3000 ESB Bus Node Unit

The Yokogawa ANB11D-215/BU2B, also cataloged as the ANB11D Dual-Redundant ESB Bus Node Unit, operates as a dedicated hardware component for field I/O module housing and data communication within CENTUM VP and CENTUM CS 3000 Distributed Control System platforms.

Suffix Breakdown & Model Matrix

Code	Type	Description
ANB11D	Base Model	Dual-Redundant ESB Bus Node Unit (19-inch Rack Mountable)
-215	Suffix	Dual-redundant 100 to 120 V AC power supplies, 50/60 Hz, with specific regulatory/explosion-proof compliance
/BU2B	Option	Base unit configuration, specific mounting brackets, or dedicated terminal block styles

Hardware Specifications

Parameter	Specification
Model	ANB11D-215/BU2B
Brand	Yokogawa
Origin	Japan
I/O Module Slots	8 slots (supports standard CENTUM I/O modules)
Communication Interface	Dual-redundant ESB Bus interface
Power Supply Voltage	100 to 120 V AC (Operating range: 85 to 132 V AC)
Frequency	50/60 Hz (+/-3 Hz)
Power Consumption	Max. 200 VA
Insulation Resistance	20 Mohm or more at 500 V DC (between grounding and power terminals)
Operating Temp	0 to 50 degC (32 to 122 degF)
Operating Humidity	5 to 95% RH (Non-condensing)
Temperature Change Rate	Within +/-10 degC/hour
Vibration Resistance	0.15 mm P-P (1 to 58 Hz), 4.9 m/s2 (58 to 150 Hz)
Mounting Type	19-inch rack mountable (4U or 5U vertical height configuration)
Connection Type	M4 screw terminals for power and grounding
Weight	Approximately 10 kg (excluding I/O modules)
Dimensions	Standard 19-inch width (approx. 482.6 mm)

Channel Isolation and HART Loop Protocol Integrity

The ANB11D architecture is engineered to maintain high-integrity digital and analog signaling across all 8 internal slots. When deploying 4-20 mA HART loop protocol modules within this node unit, the backplane infrastructure enforces channel-to-channel isolation to prevent ground loops and common-mode noise propagation between field instruments and the Field Control Station (FCS). This isolation safeguards the superimposed digital HART signal from attenuation, ensuring deterministic process variable tracking and reliable pass-through of device diagnostics to the CENTUM asset management subsystem.

Frequently Asked Questions

• Q: Can the integrated power supply modules be replaced online while the node is operational?
• A: Yes. The dual-redundant power supply configuration supports hot-swapping. A single power supply module can handle the full current load of the backplane and all 8 I/O slots during a replacement procedure without interrupting system operations.
• Q: What is the maximum permitted communication latency across the dual-redundant ESB bus interface?
• A: The hardware interface operates at deterministic bus speeds specified by the CENTUM architecture, ensuring sub-millisecond data refresh cycles between the node backplane and the master Field Control Station.
• Q: How does the unit handle temporary voltage drops on the AC input line?
• A: The internal power supplies feature built-in holdup time capabilities that allow the node unit to ride through brief voltage sags within the limits specified by Yokogawa hardware standards without triggering a node reset.

Field Installation Guidelines

• Grounding Requirements: A dedicated instrument ground must be connected to the M4 grounding terminal. The grounding resistance must conform to local electrical codes (typically less than 100 ohms) to ensure proper operation of the internal noise filters and isolation barriers.
• Wiring and Clearance: Maintain a minimum clearance around the rack assembly as specified in the technical manual to ensure unobstructed convective airflow. High-voltage power distribution wiring must be physically segregated from the low-voltage ESB bus cables and analog signal lines to prevent electromagnetic coupling.
• Terminal Screw Torque: All M4 screw terminals for power input and protective grounding must be torqued to the manufacturer-specified rating to prevent high-resistance connections and accidental loosening due to plant vibration.

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